The river slows down, the volume of water falls, the amount of material is too much, the water is shallower and if the river reaches the mouth.

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How are V-shaped valleys formed?

The river vertically erodes, as it does so the steep sides are attacked by weather which causes them to erode. The loosened material falls down creating a slope, resulting in a V-shaped valley.

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How are waterfalls and gorges formed?

They are formed when there is hard rock above soft rock. Water flows over the rock eroding the soft rock more quickly, this results in the hard rock over-hanging. Eventually the overhang will collapse and the process will repeat forming a gorge.

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How are meanders formed?

These are formed from deposition on the inside of the bend and erosion on the outside, due to differences in speed of the water flow. This creates bends in the river which are meanders.

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How are levees formed?

These are formed from repeated flooding of a river's banks, the water retreats back to the river but deposits sediment creating natural embankments, levees.

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How are deltas formed?

As river nears the mouth it deposits more material, this material creates deltas.